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Preparation method of <131>I<-> high-efficiency adsorbent in nuclear wastewater

A technology for nuclear wastewater and adsorbents, applied in chemical instruments and methods, nuclear engineering, other chemical processes, etc., can solve the problems of complex and expensive means, and achieve the effects of wide sources, low cost and simple preparation process

Inactive Publication Date: 2013-06-26
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The effective treatment of radioactive waste is the guarantee for the widespread and peaceful use of radioactive isotopes, but the existing methods are complex and extremely expensive (such as membrane separation, etc.)

Method used

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  • Preparation method of &lt;131&gt;I&lt;-&gt; high-efficiency adsorbent in nuclear wastewater
  • Preparation method of &lt;131&gt;I&lt;-&gt; high-efficiency adsorbent in nuclear wastewater
  • Preparation method of &lt;131&gt;I&lt;-&gt; high-efficiency adsorbent in nuclear wastewater

Examples

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Effect test

Embodiment 1

[0036] 6g of 325 mesh anatase titanium dioxide particles were mixed with 80mL of 10M NaOH aqueous solution, and the mixed suspension was ultrasonically dispersed at 30W for 30min to make it uniformly dispersed.

[0037] Pour the ultrasonic dispersion liquid into the polytetrafluoroethylene lining of the hydrothermal reaction kettle, tighten the hydrothermal reaction kettle and put it into the oven. The temperature of the oven is adjusted to 180°C, and the reaction time is 48h.

[0038] The precipitate after the hydrothermal reaction was collected, washed repeatedly with distilled water, and dried in vacuum at 80°C for 12 hours to obtain white Na 2 Ti 3 o 7 sodium titanate nanofibers.

[0039] Mix 2g of sodium titanate nanofibers with 2L of pure water evenly, and titrate with 1M NaOH solution, so that the pH of the dispersion is 11.

[0040] The alkalized dispersion was centrifuged at a speed of 10000 rpm for 10 minutes. Pour off the supernatant and collect the precipitate....

Embodiment 2

[0045] 12g of 325 mesh anatase titanium dioxide particles were mixed with 160mL of 10M NaOH aqueous solution, and the mixed suspension was ultrasonically dispersed at 30W for 30min to make it uniformly dispersed.

[0046] Pour the ultrasonic dispersion liquid into the polytetrafluoroethylene lining of the hydrothermal reaction kettle, tighten the hydrothermal reaction kettle and put it into the oven. The temperature of the oven is adjusted to 150°C, and the reaction time is 48h.

[0047]The precipitate after the hydrothermal reaction was collected, washed repeatedly with distilled water, and dried directly in an oven at 80°C for 12 hours to obtain white Na 2 Ti 3 o 7 sodium titanate nanotubes.

[0048] Mix 1 g of sodium titanate nanofibers with 1 L of pure water evenly, and titrate with 0.1 M NaOH solution, so that the pH of the dispersion is 10.5.

[0049] The alkalized dispersion was centrifuged at a speed of 12000 rpm and a centrifugation time of 6 min. Pour off the sup...

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Abstract

The invention discloses a preparation method of a <131>I<-> high-efficiency adsorbent in nuclear wastewater, which comprises the following steps: synthesizing sodium titanate nanotubes and nano fibers by a hydrothermal process, and doping and curing nano silver oxide particles to obtain the high-efficiency adsorbent. The high-efficiency adsorbent can quickly and efficiently adsorb and filter nuclear pollution wastewater, can be used for avoiding diffusion of radioactive substance <131>I<-> and other radioiodine isotopes, and is widely used for nuclear accident emergency, nuclear facility shielding and medical radioactive wastewater treatment.1g of the novel adsorbent can be used for filtering and purifying 1 ton of radioactive wastewater; and the adsorbent can completely absorb and fix the radioactive substance <131>I<-> in the nuclear wastewater with the radioactive <131>I<-> content of lower than 200 ppm, and thus, is a high-efficiency adsorbing material with directional selectivity.

Description

technical field [0001] The present invention relates to an Ag 2 Preparation method of O-doped nano titanate adsorbent, especially in radioactive waste water 131 I - Preparation method of high-efficiency adsorbent. Background technique [0002] The heat source of nuclear power plants is mainly uranium-235 ( 235 U), when a 235 When the nucleus of U is bombarded by external neutrons, it splits into two nuclei with smaller masses and releases 2 to 3 neutrons at the same time. These neutrons go on to bombard other 235 U atomic nuclei, thus the continuous chain fission reaction can release huge energy. 235 U fission produces more than 300 kinds of nuclide products, which are mainly distributed in the peak range of mass number 90-95, 130-140. After removing a large number of nuclides with low yield or short half-life, the main fission product obtained is iodine-131( 131 I), cesium-137 ( 137 Cs), strontium-90 ( 90 Sr) and so on. 131 I will undergo beta decay, emitting beta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30G21F9/12
Inventor 杨东江佘希林李建江
Owner QINGDAO UNIV
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